[tex]1\frac{11}{20}=\frac{31}{20}=\frac{31*5}{20*5}=\frac{155}{100}=1,55\\\\b)\\\\\frac{7}{50}=\frac{7*2}{50*2}=\frac{14}{100}=0,14\\\\c)\\\\3\frac{1}{25}=\frac{76}{25}=\frac{76*4}{25*4}=\frac{304}{100}=3,04\\\\d)\\\\\frac{3}{8}=\frac{3*125}{8*125}=\frac{375}{1000}=0,375[/tex]
